package com.atguigu.gulimall.product.service.impl;

import com.atguigu.gulimall.product.service.CategoryBrandRelationService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.*;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.product.dao.CategoryDao;
import com.atguigu.gulimall.product.entity.CategoryEntity;
import com.atguigu.gulimall.product.service.CategoryService;
import org.springframework.transaction.annotation.Transactional;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {
    @Autowired
    CategoryBrandRelationService categoryBrandRelationService;
    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {
        //查询所有分类
        List<CategoryEntity> entities = baseMapper.selectList(null);
        //组装成父子结构
        return entities.stream()
                //过滤找出一级分类
                .filter(categoryEntity -> categoryEntity.getParentCid()==0)
                // 处理，给一级菜单递归设置子菜单
                .peek(menu -> menu.setChildren(getChildren(menu,entities)))
                // 按sort属性排序
                .sorted(Comparator.comparingInt(menu -> (menu.getSort()==null?0:menu.getSort())))
                .collect(Collectors.toList());


//        List<CategoryEntity> level1Menus = entities.stream().filter(categoryEntity ->
//             categoryEntity.getParentCid() == 0
//        ).map((menu)->{
//            menu.setChildren(getChildren(menu,entities));
//            return menu;
//        }).sorted((menu1,menu2)->{
//            return  (menu1.getSort()==null?0:menu1.getSort())- (menu2.getSort()==null?0:menu2.getSort());
//        }).collect(Collectors.toList());
//        return level1Menus;
    }

    @Override
    public void removeMenuByIds(List<Long> asList) {
        //TODO 检查当前删除的菜单，是否被其他地方引用
        baseMapper.deleteBatchIds(asList);
    }

    @Override
    public Long[] findCatelogPath(Long catelogId) {
        List<Long> paths = new ArrayList<>();

        List<Long> parentPath = findParentPath(catelogId, paths);
        Collections.reverse(parentPath);

        return parentPath.toArray(new Long[parentPath.size()]);
    }
    @Transactional
    @Override
    public void updateCascade(CategoryEntity category) {
        this.updateById(category);
        categoryBrandRelationService.updateCategory(category.getCatId(),category.getName());

    }

    private List<Long> findParentPath(Long catelogId,List<Long> paths){
        paths.add(catelogId);
        CategoryEntity byId = this.getById(catelogId);
        if (byId.getParentCid()!=0){
            findParentPath(byId.getParentCid(),paths);
        }
        return paths;
    }

    //递归查找所有菜单的子菜单
    private List<CategoryEntity> getChildren(CategoryEntity root,List<CategoryEntity> all){
//        List<CategoryEntity> children = all.stream().filter(categoryEntity -> {
//            return categoryEntity.getParentCid() == root.getCatId();
//        }).map(categoryEntity -> {
//            //找到子菜单
//            categoryEntity.setChildren(getChildren(categoryEntity, all));
//            return categoryEntity;
//        }).sorted((menu1, menu2) -> {
//            return (menu1.getSort() == null ? 0 : menu1.getSort()) - (menu2.getSort() == null ? 0 : menu2.getSort());
//        }).collect(Collectors.toList());
//
//        return children;
        return all.stream()
                .filter(categoryEntity -> categoryEntity.getParentCid().equals(root.getCatId()))
                .peek(categoryEntity -> {
                    categoryEntity.setChildren(getChildren(categoryEntity,all));
                })
                .sorted(Comparator.comparingInt(menu -> (menu.getSort()==null?0:menu.getSort())))
                .collect(Collectors.toList());
    }
}